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Use sublw for comparison with literals instead of subwf.

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llvm-svn: 63382
This commit is contained in:
Sanjiv Gupta 2009-01-30 07:55:25 +00:00
parent 5db99442e4
commit b4cf873468
1 changed files with 10 additions and 8 deletions
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18
lib/Target/PIC16/PIC16ISelLowering.cpp
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@ -1288,23 +1288,25 @@ SDValue PIC16TargetLowering::getPIC16Cmp(SDValue LHS, SDValue RHS,
}
PIC16CC = DAG.getConstant(CondCode, MVT::i8);
SDVTList VTs = DAG.getVTList (MVT::i8, MVT::Flag);
// These are signed comparisons.
SDValue Mask = DAG.getConstant(128, MVT::i8);
if (isSignedComparison(CondCode)) {
LHS = DAG.getNode (ISD::XOR, MVT::i8, LHS, Mask);
LHS = DAG.getNode (ISD::XOR, MVT::i8, LHS, Mask);
RHS = DAG.getNode (ISD::XOR, MVT::i8, RHS, Mask);
}
SDVTList VTs = DAG.getVTList (MVT::i8, MVT::Flag);
// We can use a subtract operation to set the condition codes. But
// we need to put one operand in memory if required.
// Nothing to do if the first operand is already a direct load and it has
// only one use.
if (! (isDirectLoad(LHS) && LHS.hasOneUse()))
// Put first operand on stack.
LHS = ConvertToMemOperand (LHS, DAG);
// Nothing to do if the first operand is already a valid type (direct load
// for subwf and literal for sublw) and it is used by this operation only.
if ((LHS.getOpcode() == ISD::Constant || isDirectLoad(LHS))
&& LHS.hasOneUse())
return DAG.getNode(PIC16ISD::SUBCC, VTs, LHS, RHS);
SDVTList Tys = DAG.getVTList(MVT::i8, MVT::Flag);
// else convert the first operand to mem.
LHS = ConvertToMemOperand (LHS, DAG);
return DAG.getNode(PIC16ISD::SUBCC, VTs, LHS, RHS);
}